... out of punching screen and oil, gas or water in stratum can pass punching aperture and perforation on central tube ... anti-corrosive performance Central tube adopts API standard casing or oil tube. precise punched slotted screen jacket adopts ... to requirement.StandardAPI 5L, API 5CT,GB, etc.PackingContainer or as per customers requirementApplications rangePetroleum, chemical, power, gas, metallurgy ...